| 1. | The nature of light was therefore a longitudinal wave.
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| 2. | Mechanical longitudinal waves have been also referred to as " compression waves ".
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| 3. | :Longitudinal waves and transverse waves can travel at different velocities in the same medium.
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| 4. | Oliver Heaviside criticised Helmholtz's electromagnetic theory because it allowed the existence of longitudinal waves.
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| 5. | Moreover, they are longitudinal waves.
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| 6. | The theory of Huygens was not accepted, by some, because longitudinal waves cannot show birefringence.
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| 7. | It is of a bright, transparent ash color, covered with longitudinal waved and reddish lines.
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| 8. | In solids, mechanical waves can take many forms including longitudinal waves, transverse waves and surface waves.
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| 9. | Tesla incorrectly believed that X-rays were longitudinal waves, such as those produced in waves in plasmas.
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| 10. | He also suggested that the " absence " of longitudinal waves suggested that the aether had negative compressibility.
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